From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC][PATCH] kmap_atomic_push
Date: Fri, 09 Oct 2009 00:32:30 +0200
Message-ID: <1255041150.17055.24.camel@laptop>
References: <1255016123.17055.17.camel@laptop>
	 <20091008155344.GA11727@elte.hu> <1255019362.26976.311.camel@twins>
	 <alpine.LFD.2.01.0910080945230.3432@localhost.localdomain>
	 <Pine.LNX.4.64.0910081850270.4553@sister.anvils>  <4ACE674E.30403@hp.com>
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Return-path: <linux-arch-owner@vger.kernel.org>
Received: from bombadil.infradead.org ([18.85.46.34]:41152 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1757447AbZJHWd0 (ORCPT
	<rfc822;linux-arch@vger.kernel.org>); Thu, 8 Oct 2009 18:33:26 -0400
In-Reply-To: <4ACE674E.30403@hp.com>
Sender: linux-arch-owner@vger.kernel.org
List-ID: <linux-arch.vger.kernel.org>
To: jim owens <jowens@hp.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>, Linus Torvalds <torvalds@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>, Avi Kivity <avi@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, David Howells <dhowells@redhat.com>, lkml <linux-kernel@vger.kernel.org>, linux-arch <linux-arch@vger.kernel.org>

On Thu, 2009-10-08 at 18:27 -0400, jim owens wrote:
> So if I understand this correctly, the sequence:
> 
> in = kmap_atomic(inpage, KM_USER1);
> 
> out = kmap_atomic(outpage, KM_USER0);
> 
> kunmap_atomic(in, KM_USER1);
> 
> in = kmap_atomic(next_inpage, KM_USER1);
> 
> is now illegal with this patch

Yep.